INTRODUCTON TO WATER QUALITY IN AQUACULTURE Unit 4.1

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INTRODUCTON TO WATER QUALITY IN AQUACULTUREUnit
4.1 Dissolved Oxygen/Aeration
Auburn University Department of Fisheries and
Allied Aquacultures
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Types of aerators for aquaculture
Paddlewheel Propeller aspirator Vertical
pump Pump sprayer Diffused - air
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Paddlewheel aerator
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Propeller - aspirator
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Vertical pump
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Pump-sprayer aerator
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Diffused air
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Aerator Use
Supplemental - permanent
Emergency - mobile
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How does an aerator work?
Paddlewheel, vertical and pump sprayers
atmosphere
oxygen
atmosphere
oxygen
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How does an aerator work?
Propeller aspirator and diffused air
atmosphere
o2
o2
o2
o2
o2
o2
water
o2
o2
o2
o2
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Advantages of aerator use
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Effects of aeration
Performance of Channel catfish stocked in ponds aerated 6 h per night or ponds with emergency aeration only. Performance of Channel catfish stocked in ponds aerated 6 h per night or ponds with emergency aeration only. Performance of Channel catfish stocked in ponds aerated 6 h per night or ponds with emergency aeration only.
Variable Aeration 6h/night Emergency aeration
Fish stocked (no./ha) 10000 10000
Fish harvested (no./ha) 9708 9410
Harvest weight (kg/ha) 4813 3657
Ave.fish weight (g) 496 389
Feed applied (kg/ha) 6229 6229
Feed Conversion Ratio 1.32 1.75
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Aerator placement in ponds
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End of Unit